| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | |
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| 3 | /* Try to choose an implementation variant via Kconfig */ |
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| 4 | #ifdef CONFIG_CRC32_SLICEBY8 |
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| 5 | # define CRC_LE_BITS 64 |
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| 6 | # define CRC_BE_BITS 64 |
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| 7 | #endif |
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| 8 | #ifdef CONFIG_CRC32_SLICEBY4 |
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| 9 | # define CRC_LE_BITS 32 |
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| 10 | # define CRC_BE_BITS 32 |
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| 11 | #endif |
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| 12 | #ifdef CONFIG_CRC32_SARWATE |
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| 13 | # define CRC_LE_BITS 8 |
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| 14 | # define CRC_BE_BITS 8 |
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| 15 | #endif |
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| 16 | #ifdef CONFIG_CRC32_BIT |
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| 17 | # define CRC_LE_BITS 1 |
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| 18 | # define CRC_BE_BITS 1 |
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| 19 | #endif |
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| 20 | |
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| 21 | /* |
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| 22 | * How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. |
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| 23 | * For less performance-sensitive, use 4 or 8 to save table size. |
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| 24 | * For larger systems choose same as CPU architecture as default. |
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| 25 | * This works well on X86_64, SPARC64 systems. This may require some |
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| 26 | * elaboration after experiments with other architectures. |
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| 27 | */ |
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| 28 | #ifndef CRC_LE_BITS |
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| 29 | # ifdef CONFIG_64BIT |
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| 30 | # define CRC_LE_BITS 64 |
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| 31 | # else |
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| 32 | # define CRC_LE_BITS 32 |
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| 33 | # endif |
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| 34 | #endif |
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| 35 | #ifndef CRC_BE_BITS |
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| 36 | # ifdef CONFIG_64BIT |
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| 37 | # define CRC_BE_BITS 64 |
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| 38 | # else |
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| 39 | # define CRC_BE_BITS 32 |
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| 40 | # endif |
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| 41 | #endif |
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| 42 | |
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| 43 | /* |
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| 44 | * Little-endian CRC computation. Used with serial bit streams sent |
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| 45 | * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. |
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| 46 | */ |
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| 47 | #if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ |
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| 48 | CRC_LE_BITS & CRC_LE_BITS-1 |
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| 49 | # error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" |
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| 50 | #endif |
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| 51 | |
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| 52 | /* |
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| 53 | * Big-endian CRC computation. Used with serial bit streams sent |
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| 54 | * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. |
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| 55 | */ |
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| 56 | #if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \ |
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| 57 | CRC_BE_BITS & CRC_BE_BITS-1 |
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| 58 | # error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}" |
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| 59 | #endif |
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| 60 | |
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